Sheet-metal-cutting machine



June 17 1 924;

. G. W. WELLS SHEET METAL CUTTING MACHINE Fi led Aug. 1. 1923 4 Sheets-Sheet 1 June 17', 1924. 1,498,499

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1 G. W. WELLS SHEET METAL CUTTING momma Filed Aug. 1. 1923 4 Sheets-Sheet 27 L l- X s "*fQ v Mum - same; Figure 4 is lines, the

bot; Figure 8 is a provi e a machine Fetter-med dune 1?, 392% entree stares GEORGE WELLS, AMESBUEY, MASSACHUSE reaaaee earner errata TTS, ASSIGNOR T0 wanm EDDY inpplication filed August 1, 1.923. Serial No. 655,124.

T 0 all whom it may concern:

Be it known that I, GEORGE W. Wants, a citizen of the United States, residin at Amesbury, in the county of Essex and tate of Massachusetts, have made a certain new and useful Invention in Sheet-Metal-Cutting Machines, of which the following isa specification.

This invention has relation to-sheet metal cuttin machines, having for an object to capable of cuttin sheet metal with a comparatively smooth e ge cut requiring little 'finishing, and especially adapted for cutting the metal in pattern form, and for cutting central parts from the metal leaving the margin or edge portion untouched. Other ob ects and advantages will appear. 4

Theinvention consists'in the novel construction and combinations of parts, as set forth in the appended claims. In the accompanying drawings, illustrating an embodiment of the invention, Figure 1' 1s a side viewf of the'invention; Figure 2 is a face view of the upper and lower cutter devices, showing the lower cutter raised in dotted lines; Figure 3 is a side view. of the a fragmentary section on the line 44, Figure 5; Figure 5 is a face view of the upper cutter device (with lower cutter shown in dotted lines) front plate being removed; and the lowermost position of the upper cutter being shown 1n dotted path of travel of the po nt of the upper cutter being shown diagrammatically as a clrcle; Figure 6 shows detail face and side views of the upper cutter blade is a detail side view of the plvot Fi re 7 detail side view of a modified form of lower cutter; Figure 9 is a detailed side view of the adjustable vertical fragmentary diagrammatic face views of the upper cutter blade, in enfgagement-with the sheet metal being cut, in our positions of the cycle of operation, Figure 12'showing first position at start, Figure'13 showing second position approaching end of first quarter, Figure 10 third position at end of second quarter, and Figure 11 fourth position just past completion of third quarte r.

In these drawings the numeral 1 desi nates the pedestal or base, supporting 't e horizontal frame 2, having upper and lower horizontally spaced portions, at the free said ported upon the center of the sleeve 20 of' the ends of which the cutting devices are mounted and work.

The lower jaw 3 of the cutting device guide way 1, being normal through force of gravity in a lowered position in said guideway, shown in Figure 2 of the drawings, with its upper cutting edge projecting slightly above the lateral beveled projections '5 at the sides of the top of said guideway. This lower jaw or blade in said lowered position rests upon the cam portion 6 of a lever 7, connecting rod 8 to a pedal lever by the operation of lower jaw or blade to the position shown in Figure 1 with the work previously placed thereon, this work now being suphorizontally arched, or curved cutting edge 10 of said blade and being so held by the operator.

The upper jaw or blade 11 of the cutting device works in a vertical a back plate 12, secured to screws 13, said wardly converging side walls 12", and a lower contracted ortion 12, said blade havmg an upper per oration 14, engaged by the head 15 of a horizontal pivot bolt 16, said bolt being threaded at 17in an aperture 18, bored horizontally and ecoentrically of a horizontal operating shaft 19, said shaft having journal hearings in a horizontal framing, the result being that rotation of said shaft lower cutting edge of said upper jaw to de-- scribe an approximately circular' rocking or slicing path, first backwardly or in two directions, the jaw rocking inthe lower contracted said guideway in its vertical reciprocation in describing said path. The guideway 12 is. closed forwardly by a front secured to the back plate b screws 13". p The cuttin edge 21 of the upper jaw is provided wit a double incline; meeting at the center of the edge, and the stroke of said jaw is short, being about three sixteenths of an' inch.

Means are provided to limit the upward movement of the lower cutter blade or jaw in the operation of the treadle device, whereby said blade in its elevated position the framing by having a, 9, wherethe cam lever will raise will cause the guideway 12 of guideway having down-- forwardly and then portion of plate 13', Q

will properly cooperate with the upper cutspecial thickness of the metal being cut, so that the upper cutter in its slicing movement stated shall never leave the work, the latter being fed forwardly by the operator, whereby in conjunction with the short stroke of the upper jaw, a continuous and even cut of the metal is assured, succeeding cuts intersecting without break in cutting patterns and curves, and enabling central parts to be cut from the metal, leaving the marginal or edge portions untouched.

The upper cutter having a double incline from the middle of its cutting edge rovides for a blunter point not so easily 1njured.

It is designed that the thickness of the metal being cut shall preferably be such that that first half of the downward stroke of the upper jaw, being the forward slicing movement thereof, shall complete the cutting through the metal, the reverse slicing movement of the upper jaw in the last half of the downward movement thereof, being also active in elfecting a cutting of the metal provided the operator feeds the work at that time, the feeding of the work by the operator being assisted by the forward slicing movement of the cutter in said first half of the downward stroke.

The means for limiting the upward move ment of the lower cutter in the operation of the treadle and hereinbefore referred to consists of a back plate 22, including the aforesaid guideway 4 for the lower cutter, said plate having a rear lu 23, provided with an adjustable vertical b0 t connection at with the framing, and havin lateral flanges provided with vertical s ots 25, engaged by adjustable screws 26, extended into the framing. The lower cutter blade or jaw 3 is prov1ded with a lateral shoulder 27, which at the limit of the upward movement; thereof engages a shoulder 28 of the aforesaid back plate, and the latter being vertically adjusted as stated, by loosening the screws or bolts, making the adjustment and tightening the screws, the shoulder 28 will be similarly adjusted and the lower cutter blade or jaw will contact with the shoulder of the plate 28 at a greater or less elevation as the case may be.

The lower cutter blade or jaw shown mainly may be substituted by the modification shown in Figure 8 of the drawings, wherein this jaw is provided with a rolling cutter 3.

I claim 1. In a sheet metal cutting machine, a lower stationary cutter, an upper cutter caoperating therewith, and means for operat ing said upper cutter to cause its cutting ed e to travel in an endless path and to assist in the feeding of the work simultaneously with the cutting thereof.

2, In asheet metal cutting ma hine, a

naeaeee a slicing action during the effective portion of the stroke.

4. In a sheet metal cutting machine, a lower cutter, an upper cutter cooperating therewith, and means for operatin the upper cutter to cause its cutting e ge to travel in an endless path in the plane of said edge and to have a slicing action in two directions of movement.

5. In a sheet metal cutting machine, a lower cutter, an upper cutter cooperating therewith, and means for operating the upper cutter to cause its cutting e ge to travel in an endless path in the plane of said edge and to complete the cutting through the work in the first half of its downward movement.

6. In a sheet metal cutting machine, a

lower cutter, an upper cutter cooperating therewith, and means for operating the upper cutter to cause its cutting edge to travel in an endless path in the plane of said edge and to complete the cutting through the work in the first half of its downward movement, and during the second half of said downward movement to make a succeeding cut.

7. In a sheet metal cutting machine, a lower stationary cutter, and an up er cutter cooperating therewith and adapts to have its cutting edge travel in an endless path, framing having a slideway wherein said upper cutter works and provided with bearings intermediately of its length whereon said cutter is adapted to rock, and an upper eccentric operating connection for the upper cutter.

8. In a sheet metal cutting machine, upper and lower horizontally spaced supports pro vided with vertical guideways at their free ends, the lower guideway havin op osite beveled lugs at the top thereo an upper guideway having bearings intermediately of its length, a lower stationary out ter normally depressed in the lower guide way and having a curved cutting edge prcjecting slightly above said lugs, a treadle device for raising the lower cutter and the work therewith, and an upper cutter adapted to have its cutting edge travel in an endless path and having a rocking movement upon said bearings.

the

lllli IMD 9. In a sheet metal cutting machine, upper 1 and lower horizontally spaced supports provided with vertical guideways at their free ends, the lower guideway having opposite beveled lugs at the top thereof, pedal controlled means for raising the lower cutter and the work therewith, and an upper cutter adapted to have its cutting edge travel in an endless ath, said pedal controlled means being a apted for instant release to stop the operation of the machine.

10. In a sheet metal cutting machine, a lower stationary cutter, means for raising the same and the work therewith at will, and an u per .cutter adapted to have its cutting e ge travel in an endless path, the

means for raising the lower cutter and the i work being adapted for instant release to stop the operation of the machine.

11. In a sheet metal cutting machine, a lower cutter, and an upper cutter cooperating therewith and adapted to have its cutting edge travel in an endless path in the plane of said edge, an efieetive portion of the said path bein of a forward slicing nature assisting in t e feeding of the work, and means for raising the lower cutter and the work at will adapted for instant release to stop the operation of the machine.

' In testimony whereof I aflix my signature.

enonen w. Wants. 

